Drain plug



FIG. 1 is a front, top, and right side perspective view of a drain plug, showing my new design;

FIG. 2 is a rear, bottom and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines depict portions of the drain plug that form no part of the claimed design. 

CLAIM The ornamental design for a drain plug, as shown and described. 